
limas
Presentation
•
Mathematics
•
7th Grade
•
Practice Problem
•
Hard
Ahmad Zulfikri
Used 4+ times
FREE Resource
18 Slides • 0 Questions
1
volume limas
Oleh : Ahmad Zulfikri
2
3
Contoh nyata bentuk limas
Piramida, Mesir
Louvre Museum, Prancis
Masjid Agung Demak
4
MATERI
5
Hubungan kubus dengan limas
A
B
D
C
E
F
H
G
T
a
a
a
A
B
D
C
T
a
a
a
𝑉𝑜𝑙𝑢𝑚𝑒 𝐾𝑢𝑏𝑢𝑠 = _______ × 𝑉𝑜𝑙𝑢𝑚𝑒 𝑙𝑖𝑚𝑎𝑠
6
𝑉𝑜𝑙𝑢𝑚𝑒 𝐾𝑢𝑏𝑢𝑠 = 3 × 𝑉𝑜𝑙𝑢𝑚𝑒 𝑙𝑖𝑚𝑎𝑠
𝑠3= 3 × 𝑉𝑜𝑙𝑢𝑚𝑒 𝑙𝑖𝑚𝑎𝑠
𝑎3= 3 × 𝑉𝑜𝑙𝑢𝑚𝑒 𝑙𝑖𝑚𝑎𝑠
𝑎 × 𝑎 × 𝑎 = 3 × 𝑉𝑜𝑙𝑢𝑚𝑒 𝑙𝑖𝑚𝑎𝑠
(𝑎 × 𝑎) × 𝑎 = 3 × 𝑉𝑜𝑙𝑢𝑚𝑒 𝑙𝑖𝑚𝑎𝑠
𝑙𝑎𝑙𝑎𝑠 × 𝑎 = 3 × 𝑉𝑜𝑙𝑢𝑚𝑒 𝑙𝑖𝑚𝑎𝑠
𝑙𝑎𝑙𝑎𝑠 × 𝑡 = 3 × 𝑉𝑜𝑙𝑢𝑚𝑒 𝑙𝑖𝑚𝑎𝑠
𝑉𝑜𝑙𝑢𝑚𝑒 𝑙𝑖𝑚𝑎𝑠 = 1
3(𝑙𝑎𝑙𝑎𝑠 × 𝑡)
→ 𝑎 = 𝑡(𝑡𝑖𝑛𝑔𝑔𝑖 𝑙𝑖𝑚𝑎𝑠)
7
Hubungan kubus dengan limas
A
B
D
C
E
F
H
G
2a
2a
2a
A
B
D
C
E
F
H
G
T
2a
2a
2a
8
Volume kubusabcdefgh
A
B
D
C
E
F
H
G
2a
2a
2a
Luas alas:
𝐿𝑎 = 2𝑎 × 2𝑎
Tinggi:
𝑡 = 2𝑎
Volume:
𝑉𝑘 = 2𝑎3
= 2𝑎 × 2𝑎 × 2𝑎
= 2𝑎 × 2𝑎 × 2𝑎
= 𝐿𝑎 × 2𝑎
9
VOLUME LIMAS ABCDT
A
B
D
C
E
F
H
G
T
2a
2a
2a
Luas alas:
𝐿𝑎 = 2𝑎 × 2𝑎
Tinggi:
𝑡 = 𝑎
Volume:
𝑉𝑙 =1
6 2𝑎 3
= 1
62𝑎 × 2𝑎 × 2𝑎
= 1
3 𝐿𝑎 × 𝑎
= 1
3𝐿𝑎 × 𝑡
10
RUMUS VOLUME LIMAS
𝑉𝐿𝑖𝑚𝑎𝑠 =1
3 𝐿𝑎𝑙𝑎𝑠 × 𝑡
11
contoh SOAL
12
01
Sebuah limas tegak alasnya berbentuk persegi yang sisi-
sisinya 12 cm. Puncak limas tepat berada diatas pusat alas
dan tingginya 30 cm. Hitunglah volume limas .
Penyelesaian:
Diket:
S = 12 cm
t limas = 30 cm
Ditanya: V limas?
Jawab
𝑣𝑙𝑖𝑚𝑎𝑠 =1
3 𝐿𝑎 × 𝑡
𝑣𝑙𝑖𝑚𝑎𝑠 = 1
3 (𝑆 × 𝑆) × 𝑡
𝑣𝑙𝑖𝑚𝑎𝑠 =1
3 12 × 12 × 30
𝑣𝑙𝑖𝑚𝑎𝑠 = 1
3144 × 30
𝑣𝑙𝑖𝑚𝑎𝑠 = 144 × 10 = 1440 𝑐𝑚3
13
02
Sebuah limas tegak alasnya berbentuk segitiga sama kaki yang
memiliki Panjang rusuk alas 10 cm dan tinggi alas 12 cm. Puncak
limas tepat berada diatas pusat alas dan tingginya 8 cm.
Hitunglah volume limas .
Penyelesaian:
Diket: limas segitiga
a=10 cm
t alas = 12 cm
t limas = 8 cm
Ditanya: V limas?
𝑣𝑙𝑖𝑚𝑎𝑠 = 1
3 𝐿𝑎 × 𝑡
𝑣𝑙𝑖𝑚𝑎𝑠 =1
3
1
2 𝑎 × 𝑡𝑎𝑙𝑎𝑠
× 𝑡𝑙𝑖𝑚𝑎𝑠
𝑣𝑙𝑖𝑚𝑎𝑠 = 1
3
1
2× 10 × 12 × 8
𝑣𝑙𝑖𝑚𝑎𝑠 = 1
3 60 × 8
𝑣𝑙𝑖𝑚𝑎𝑠 = 20 × 8 = 160 𝑐𝑚3
Jawab:
14
LATIHAN SOAL
15
01
Alas sebuah limas berbentuk belah ketupat dengan Panjang
diagonal-diagonalnya 10 cm dan 15 cm. tinggi limas adalah
18 cm. Berapakan volume limas tersebut?
450 cm^3
a
1350 cm^3
900 cm^3
2700 cm^3
c
b
d
16
02
Bu darmi membuat sebuah makanan yang
dibungkus dengan daun pisang menyerupai
bentuk limas. kemasan tersebut memiliki
panjang alas 8 cm dan lebar alas 5 cm. jika
kemasan tersebut mempunyai volume 80
cm^3, tinggi bungkus tersebut adalah……………
2 cm
6 cm
3 cm
9 cm
c
a
b
d
17
03
Atap sebuah gedung berbentuk limas dengan
alas berupa persegi panjang berukuran 10 m ×
15 m. Tinggi atap itu (tinggi limas) adalah 12 m.
Volume udara yang terdapat dalam ruang
atap itu adalah…….
1800 m^3
1200 m^3
900 m^3
600 m^3
a
c
b
d
18
Terima kasih
volume limas
Oleh : Ahmad Zulfikri
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